Expansion-piston lapping-in tool



Jan. 29, 1924 O. C. MOORE EXPANSION PISTON LAPPING-IN TOOL Filed Jan. l51921 patented `lan. 29, 1.924. i

l UNITED STATES OLIVER C. MOORE, OF OLIEVIEil'JAIl'I), OHIO.

EXPANSION-PISTON LAPPING-IN TOOL.

- Application led January 15, 1921. Serial No. 437,576.

To all whom t may concern.'

Be it known that I, OLIVER C. MOORE, a citizen of the United States, anda resident of Cleveland, county of Cuyahoga, and State of Ohio, haveinvented a new and useful Improvement in Expansion-Piston LappinglnTools, of which the following is a specitication, the principle of theinvention beingi herein explained, and the best mode in which I havecontemplated applying that principle, so as to distinguish it from otherinventions.

This invention relates to a lapping-in tool in the form of an expansionpiston. More breakage and uneven wear.

particularly, it comprises, in one of the forms of itsy construction,four quarter sections, which sections are held in spaced regive muchtrouble in attempting to produce y satisfactory woik, inasmuch as theyare frequently out of round and are subject to Likewise, the properdistribution of the abrasive substance 1s in no way provided for and.accurate work is impossible with Such appliances. i

The principal object of my invention-is to avoid the disadvantagesnoted, by supplying a lapping-in tool of such character that it may beaccurately fitted in circumferential adjustment to the work in hand andmay, if desired, be readjusted during the progress of the work.

Further objects of my invention will ap'- pear .in the course of thefollowing description, among them being the provision of grooves for theproper distribution of the abrasive substance used, as well as areservoir to hold the abrasive substance for distribution to suchgrooves. To the accomplishment of the foregoing and related ends, Saidinvention, then, consists of the means hereinafter fully described andparticularly pointed out in the claims. y

The annexed -drawing and the following description setforth in detailcertain mechanism embodying the invention, such disclosed meansconstituting, however.,v but one of various mechanical forms in Ywhichthe principle of the invention may be used.

In said lannexed drawing:

Fig. 1 is a transverse y, vertical sectional View showing my completeapparatus in as'- Sembled relation; Fig. 2 is a transverse horizontalsection taken along the line 2 2 shown in Fig. 1 looking in thedirection of the arrows; Fig. 3 is a plan view partially in sectiontaken along the line 3--3 in Fig. 1 looking in the direction of thearrows; Fig. 4 is a side elevation of the outer face of one of thesectionsshowing the spring grooves, abrasive supplyl duct` andconnecting channelways; Fig. 5vis a perspective view of one of thepiston sectionsshowing its interior construction and the manner offitting the abrasive supply elements thereto; and Fig. 6

is a transverse horizontal sectional viewA showing a modified form of myapparatus wherein an inner tapered element of rectangular cross-sectionis used.

As illustrated inthe drawing, a tubular member or Stem 1 has mounted onits upper end a handle2 and upon its lower end a circular plate 3.Wiithin said tubular member is positioned al rod 4, the lower end ofwhich carries a screw-threaded portion 5 upon which is en aged aninternally threaded conical mem er 6, which may be of any desiredcross-section, depending upon the particular use to which the tool is tobe vputand the number of lappin -in Sections employed, such formbeingcircu ar as shown in Figs. 1, 2 and 3, and rectangular as *shown inFig. 6. The upper end of said rod is of smaller diameter than its mainsection and it terminates in a portion 7 of squared or'other suitablecross-section to permit the engagement therewith of a wrench or otheroperating member. nInwardly of said squared portion the rod is screwthreaded for a short distance to provide for the engagement cylindricalmember, which are provided upon their inner sides with inwardlyextending lugs 16, 17, of a shape suitable to ride against the surfaceof the conical or tapered member 6 upon the rod, heretofore referred to,and are of such graduated len th as to maintain the outer sides of saidcylmdrical sections lin vertical position, whatever positionlongitudinally they occu y with respect to such tapered member.

o maintain the cylindrical sections in proper spaced relation about theVtapered support, I preferably provide a series ofribs or projections 21and cooperating grooves or notches 22 centrally of the bearing surfacesof said lugs and upon the adjacent surface of thev supporting member,respectively. In

the modified form shown in Fig. 6 the-flat faces 23 of the taperedmember of rectangular cross-section 24, of themselves serve to positionthe cylindrical sections. `(lo-acting ribs and grooves may be employedhowever to key the parts into position as in the other constructiondescribed, but, as shown `in Fig. 6, the ribs 25 are provided on thetapered member and the grooves 26 upon the flat faces 27 of the lugs 28.Obviously the position of these parts may be reversed as desired, inview of considerations of ease of manufacture and assembling.

The upper edges of each of these cylinder sections are provided withinwardly extending flanges designed to rest upon the circular plate 3upon the end of the tubular Lvstem heretofore referred to. They are heldin clamped relation to this plate by means of a clamping disk 29,suitably notched to allow free radial movement for the tubular abrasivesupply ducts, and held in position by a locking member 30 threadedlyengaged upon the stem 1 and adjustable thereon by means of a hand-wheel34.

YEach of the cylinder sections is provided with a plurality oftransverse grooves 31, 32 about its circumference within which areplaced coil spring bands 33 which serve to maintain said cylindersections in close engagement with the tapered central member. Thegrooves are made deeper than necessary to accommodate the springs inorder to provide a small amount of space at the outer side thereof forthe reception and distribution of the abrasive mixture used. Thisabrasive mixture, consisting ordinarily of carborundum and oil, ispreferably supplied to the grooves by wiping the same therein prior tothe insertion of the tool in the cylinder, but the supply is maintainedthrough a tubular passageway or duct 35 communicating with a reservoirin the form of an oilA cup 36 held vertically above the flange at theupper edge of each of the cylinder sections and passing through the sidewall of said section at a central point thereof midway of the two springgrooves heretofore 1,4s2,ose

described. Diagonal channel-ways 37 cut into the outer surface -of eachofthe cylinder sections afford a means of communication from -the oilduct aperture to adjacent parts of tle respective spring grooves.

From the construction above described, it will be noted that means foradjusting the diameter of the sectional cylinder has been disclosed, aswell as means for locking the same into any predetermined adjustedposition. When it is desired to make a new adjustment, the hand-wheel 34upon the clamping member 30 is rotated to unlocking position and thesquared end 7 of the rod 4 within the tubular handle portion 1 is thenrotated until the desired diameter of the sectional cylinder isobtained. The clamping wheel is then turned to Ylocking position.

The manner in which my tool is used after being thus adjusted, in ameasure, is similar to that employed with the make-shift toolsheretofore described. ,Thus, abrasive compound may be supplied to thesurface of the lapping-in tool by turning down the plungers on the cureservoirs and the tool vis then manually shifted up and down in theinterior of the cylinder to be ground to proper size, and during thecourse of such reciprocation, is oscillated back and forth so as topresent a new .surface of the tool to the art worked u on, at eriodicintervals. the use o the ordinary tool, it is necessary, after a certainamount of work has been accomplished, to withdraw the tool and manuallyrenew the supply of abrasive mixture, but with the tool I have provided,the abrasive mixture originally supplied wiPthin the spring groove 5 iscontinuously added to from the reservoirs I have provided on each of thecylinder sections and the implement is thus suitable for continuousoperation. The abrasive mixture used is maintained of uniform characterthrough the use of my apparatus and a great saving in the amount usedwill also result. Thus the work of lapping-in engine cylinders may bemost accurately and economically accomplished.

Other modes of applying the principle of my invention may be employedinstead of the one explained, change being made as regards the mechanismhereiny disclosed, provided the means stated by any of thefollowingclaims or the equivalent of such stated means be employed.

I, therefore, particularly point out and distinctly claim as myinvention 1. Av lapping-in tool, comprising a pair of ith relativelymovable supporting members, a i

sectional cylinder supported upon one of said supporting members,coacting means supported upon the other of said supporting ,members forenlarging the effective diameter of said cylinder, and resilient meansfor holding said cylinder sections together.

2. A lapping-in tool, comprising a pair of relatively movable supportingmembers, a sectional cylinder supported upon one of said supportingmembers, a reservoir for abrasive mixture associated with said cylinder'sections, channel-Ways upon the surface of said cylinder sections fordistributing said mixture, tubular means connecting saidreserj voirs andsaid channel-ways, and coacting means supported upon the other of saidsupporting members for enlarging the effective diameter of saidcylinder.

3. In a tool for the purpose set forth, in combination,a longitudinallysplit sectional shell, resilient-means for retaining said shell sectionstogether, said sections provided with horizontal partitions,a centralconical spreader passing through openings in said partitions, a screwrod for adjusting the said spreader, a sleeve 1n Whlch said rod 1srotatable, and securing means for rod, and means for detachably clampingsaid sleeve to said sectional grinding shell, said cylindrical shellprovided with peripheral recesses adapted to retain abrasive material.

4. In a. tool for the purpose set forth, in combination, a sectionalgrinding shell, provided With spaced conical central openings, a conicalspreader therein, an adjustin screw therefor, means for supporting saiscrew, and means for detachably securing said supporting means to saidsections.

1 2Sligned by me this 8th day of January,

OLIVER o. MOORE.

